1/* 2 * Userland implementation of clock_getres() for 32 bits processes in a 3 * s390 kernel for use in the vDSO 4 * 5 * Copyright IBM Corp. 2008 6 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com) 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License (version 2 only) 10 * as published by the Free Software Foundation. 11 */ 12#include <asm/vdso.h> 13#include <asm/asm-offsets.h> 14#include <asm/unistd.h> 15 16 .text 17 .align 4 18 .globl __kernel_clock_getres 19 .type __kernel_clock_getres,@function 20__kernel_clock_getres: 21 .cfi_startproc 22 chi %r2,CLOCK_REALTIME 23 je 0f 24 chi %r2,CLOCK_MONOTONIC 25 jne 3f 260: ltr %r3,%r3 27 jz 2f /* res == NULL */ 28 basr %r1,0 291: l %r0,4f-1b(%r1) 30 xc 0(4,%r3),0(%r3) /* set tp->tv_sec to zero */ 31 st %r0,4(%r3) /* store tp->tv_usec */ 322: lhi %r2,0 33 br %r14 343: lhi %r1,__NR_clock_getres /* fallback to svc */ 35 svc 0 36 br %r14 374: .long CLOCK_REALTIME_RES 38 .cfi_endproc 39 .size __kernel_clock_getres,.-__kernel_clock_getres 40